Looking at your incremental xtrabackup_checkpoints, it's going from and to the same lsn. So either there was no new data changes to backup, or the process you are following is wrong. So I would first make sure you actually have data changes from the full backup (i.e. insert a new record if this is a test database), and then follow the above guide to make sure you are following the correct process.

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Hello,
I've done the whole backup from the beginning according to your link. The effect is the same, xtrabackup_checkpoints files are identical. Write data to the database all the time because, one of database it is a network monitor logs.

Below the result of full and incremental backup: innobackupex --user=root /backup_mysql/